Nested case statements

[elliotchance]

In the sqlite3 source there is at least one example where case statements are nested. I'm sure this is possible due to the correct chain of gotos. But it's also valid in C and not in Go.

Here is an example:

case OP_ReopenIdx: {
  int nField;
  KeyInfo *pKeyInfo;
  int p2;
  int iDb;
  int wrFlag;
  Btree *pX;
  VdbeCursor *pCur;
  Db *pDb;

  assert( pOp->p5==0 || pOp->p5==OPFLAG_SEEKEQ );
  assert( pOp->p4type==P4_KEYINFO );
  pCur = p->apCsr[pOp->p1];
  if( pCur && pCur->pgnoRoot==(u32)pOp->p2 ){
    assert( pCur->iDb==pOp->p3 );      /* Guaranteed by the code generator */
    goto open_cursor_set_hints;
  }
  /* If the cursor is not currently open or is open on a different
  ** index, then fall through into OP_OpenRead to force a reopen */
case OP_OpenRead:
case OP_OpenWrite:

  assert( pOp->opcode==OP_OpenWrite || pOp->p5==0 || pOp->p5==OPFLAG_SEEKEQ );
  assert( p->bIsReader );
  assert( pOp->opcode==OP_OpenRead || pOp->opcode==OP_ReopenIdx
          || p->readOnly==0 );

  if( p->expired ){
    rc = SQLITE_ABORT_ROLLBACK;
    goto abort_due_to_error;
  }

[elliotchance]

Here is a smaller scale example:

switch (a) {
  case 1: {
    printf("a");
  case 2:
  case 3:
    printf("b");
  }
  case 4:
    printf("c");
}